Water-cooled furnace-door.



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2 SHEETS-SHEET 1.

PATBNTED SEPT. 4, 1906.

L. L. KNOX. WA-TBR GOOLED FURNACE DOOR.

APPLICATION FILED FEB. 16. 1904.

INVEN'I'OR ff fi P'U7mb 4; M

WITNESSES l TED STATES PATENT OFFICE.

FOURTH TO MONT MURRAY AND ONE-FOURTH OF PITTSBURG, PENNSYLVANIA.

WATER-COOLED TO H. E. WEISKOPF,

FURNACE-DOOR.

Specification of Letters Patent.

Patented Sept. 4, 1906.

Application filed February 15, 1904. Serial No. 193.495.

To all whom it may concern.-

Be it known that I, LUTHER L. KNOX, of Pittsburg, Allegheny county, Pennsylvania, have invented a new and useful Water- Cooled Furnace-Door, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming part of this specification, in which Figure 1 is a front elevation showing one form of my improved door. Fig. 2 is a central vertical section of the same. Fig. 3 is a top plan view. Fig. 4 is a longitudinal vertical section showing a modified form of the door. 5 is a central vertical section, and Fig. 6 is ahorizontal cross-section, of the form of Fig. 4; and Fig. 7 is a central vertical section showing another form of the invention.

My invention relates to water-cooled doors for heating or other furnaces and is designed to provide a simple and eflective structure which will be long lived.

In the drawings, refe to the form of Figs. 1, 2, and 3, I show the 001' as formed of a hollow casting, preferably of bronze, with a hollow body 2, having hollow cheeks 3 3 and a hollow top sill 4 cast in one integral piece. The bottom sill 5 is made in a separate casting in this form and is provided with forwardly-projecting flanges 6, which are bolted to similar flanges 7 at the bottom of the main door-casting.

The water is led to the lower sill by a pipe 8, which I have shown extending through an upper front lug 9 on the door, and thence down over the face of the door at one side and into the end portion of the lower sill. From this sill the water flows through a U-shaped connecting-pipe 10 at the other end into the lower portion of the main door below the transverse battle 1 1. This baffle consists'of a partition cast with the door and extending from one side to the inner. edge of the cheek at the opposite side. Above this bafile I show two similar baflles 12 and 13, extending alternately from opposite sides and causing the water rising from the door to take a tortuous collrse through the door and side cheeks. After the water has passed above the partition 13 it flows to the right and passes out through the pipe 14.

I have shown the door as provided with sets of lugs 15, by which it may be supported and raised and lowered.

In Figs. 4, 5, and 6 I show a form similar to that of 1, except that the lower sill is also cast integral with the door, and one of the cheeks is used for the down-channel of the water instead of the external pipe 8. In this form one of the cheek portions is cut off from the door-cavity by a vertical end partition 16, which extends from the top of the door down wardly to the lower sill and is cast integral with the door. In this form the water flows down through the check 3 and into the sill'5, the roof 17 of the sill being cut away at the other end to allow the water to pass up into the door-cavity, thus doing away with the pipe 10 of the first form. In this case the partitions 11 and 13 stop short of the wall 16, thus allowing the water to take a tortuous course upwardly through the door as in the first form.

In the form of Fig. 7 the inwardly-projecting cheeks and sills are done away with and the door is formed in one plain fiat casting 2. The bathing-partition and the water-inlet and connections may be the same as in the form of Fig. 4.

It will be noted that in all of the forms of doors which I have shown the top of the door 'is closed and the water passes in and out through pipes of small capacity compared to that of the door. By this construction I am enabled to feed water through the door under considerable pressure, ordinarily fifteen or twenty pounds and upward. By thus feeding water under pressure through the door I len then its life, as it is found in practice that by feeding water under pressure, and thus in creasing the speed of the current, the doors will last much longer than where the top of the door is open and the water is not under any substantial pressure. This feedi under pressure also enables me to feed the same doors, thus using the same body of water for cooling separate doors.

In us' the door of the first orsecond form the spari d hetween the cheeks and sill'sisfilled with fire-brick or suitable refractory material in the ordina manner. The door is preferably provide with the eye or peep- -water successively through a succession of hole 18, formed by coring the casting and having suitable guides 19 to receive the closing-blade.

The advantages of my invention result from the simplicity oi the construction, its long life, owing to the efficient water circulation, and avoiding of steam-pockets, the

steam passing upwardly with the water and the baffling-partitions being inclined to allow the steam to creep along under them and pass upwardly. The opposite inclinations of these partitions will be noted in Fig. 1. For this same purpose the roof of the lower sill is preferably inclined toward the outlet to allow the steam to pass up with the water and prevent formation of steam-pockets. In fact, the generally horizontal arrangement of the baffle-partitions independent of their inclination will prevent aformation of steam or air pockets, as the air and steam can creep along the under surfaces of such partitions.

The inlet water-pipe may take the form of a flexible hose or other connection leading to the lower corner of the sill, thus doing away With-the pipe or down-channel for the water, and many other variations may be made in the form and arrangement of the door, the

partitions, &c., without departing from my invention.

I claim- 1. A hollow water-cooled door, having therein a series of horizontally-extending baffles arranged to form a tortuous course for the water from the lower portion to the up-, per portion of the door, said battles being ar-' ranged to present inclined under surfaces along which air and steam can creep and thereby prevent the formation of steam-pockets; substantially as described.

2. A hollow water-cooled furnace-door having therein a series of horizontally-extending inclined bafi'les arranged to form a tortuous course for the Water from the lower to the upper portion of the door, the inclination of the baflles being in the direction of the travel of the water; substantially as described.

In testimony whereof I have hereunto set my hand.

JOHN MILLER, H. M. CoRwIN. 

